Repository logo
 
Publication

Seasonal and interannual variations in coccolithophore abundance off Terceira Island, Azores (Central North Atlantic)

2016Journal article Open access
Simple item page
dc.contributor.authorNarciso, Áurea
dc.contributor.authorGallo, Francesca
dc.contributor.authorValente, André
dc.contributor.authorCachão, Mário
dc.contributor.authorCros, Lluïsa
dc.contributor.authorAzevedo, Eduardo B.
dc.contributor.authorRamos, Joana Barcelos
dc.date.accessioned2021-11-22T12:02:04Z
dc.date.available2021-11-22T12:02:04Z
dc.date.issued2016
dc.description.abstractIn order to characterize the natural coccolithophore community occurring offshore Azores and to de-termine their annual and interannual patterns, monthly samples were collected, from September 2010 toDecember 2014, in the photic zone off Terceira Island.The present study revealed a clear seasonal distribution and a considerable interannual variability of theliving coccolithophore community. The highest coccolithophore abundances were observed during spring andwinter months, especially due to the smaller speciesEmiliania huxleyiandGephyrocapsa ericsonii. In fact, thehighest biomass period was registered during April 2011, associated with enhanced abundance of the over-calcified morphotype ofE. huxleyi,whichwaspossiblyinfluenced by subpolar waters and subsequent up-welling conditions. The highest abundances ofGephyrocapsa muelleraewere recorded during June 2011 and2014, indicating that this species characterizes the transition between the period of maximum productivity andthe subsequent smoother environmental conditions, thefirst and the later stages of the phytoplankton suc-cession described by Margalef, respectively. During summer to early fall, a gradual decrease of the overallcoccolithophore abundance was observed, while the species richness (Margalef diversity index) increased. Asubtropical coccolithophoreassemblage mainly composed byUmbellosphaera tenuis,Syracosphaeraspp.,Dis-cosphaera tubifera,Rhabdosphaera clavigeraandCoronosphaera mediterraneaindicated the presence of surfacewarmer waters accompanied by reduced mixing and low nutrients concentration. During late fall to winter, thecoccolithophore abundance increased again with a concomitant reduction in species diversity. This is poten-tially linked to low sea surface temperatures, moderate nutrients concentration and surface mixed layerdeepening. During 2011, colder and productive waters led to an increase in the total coccolithophore abun-dances. On contrary, during 2012, characterized by milder environmental conditions, an increase in the di-versity of the community was prevalent. The noticeably coccolithophore response to variations in the mainphysical variables and on main traditional nutrients corroborates the importance of this group as proxy ofmarine environmental conditions in the past.&2016 Elsevier Ltd. All rights reserved.1. IntroductionCoccolithophores are pelagic unicellular algae, members of thehaptophyte class Prymnesiophyceae Hibberd, distinguished by theability to produce calcite platelets called coccoliths, which surroundthe living cell and form an exoskeleton called coccosphere (e.g. Winterand Siesser, 1994; Young, 1994). Coccolithophores, known since thelate Jurassic (Hay, 2004), have an ocean wide distribution and re-present the most productive calcifying organisms on Earth (Honjo,1996). They also affect the ocean-atmosphere carbon dioxide exchangeand produce dimethyl sulfide (DMS), which stimulates cloud forma-tion, thus actively participating in the climate system (Berger et al.,1989;Westbroek et al., 1993;Rost and Riebesell, 2004). Since thiscalcifying group has potential to fossilize as calcareous nannoplankton,it becomes a (paleo)environmental proxy directly dependent ontemperature, salinity, and nutrients and light availability (e.g.,McIntyreand Bé, 1967;Giraudeau et al., 1993; Winter and Siesser, 1994).Coccolithophores usually dominate the phytoplankton biodiversity inthe oligotrophic central gyres of the oceans (e.g. McIntyre and Bé, 1967;Winter et al., 1994;Ziveri et al., 2004), being also markedly present attemperate (e.g.Giraudeau and Bailey, 1995;Cachão et al., 2000) and highlatitude eutrophic regimes (e.g.Andruleit, 1997;Baumann et al., 2000).Although the geographic distribution of coccolithophores hasbeen well studied over the last four decades, its seasonal dynamicsContents lists available atScienceDirectjournal homepage:www.elsevier.com/locate/csrContinental Shelf Researchhttp://dx.doi.org/10.1016/j.csr.2016.01.0190278-4343/&2016 Elsevier Ltd. All rights reserved.nCorresponding author. Present address: CIIMAR-Madeira, Caminho da Penteada105, Funchal, Portugal.E-mail address:aureanarciso@uac.pt(Á. Narciso).Continental Shelf Research 117 (2016) 43–56pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationNarciso, Á., Gallo, F., Valente, A., Cachão, M., Cros, L., Azevedo, E. B., & Ramos, J. B. (2016). Seasonal and interannual variations in coccolithophore abundance off Terceira Island, Azores (Central North Atlantic). Continental Shelf Research, 117, 43-56. https://doi.org/10.1016/j.csr.2016.01.019pt_PT
dc.identifier.doi10.1016/j.csr.2016.01.019pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.13/3840
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relationResponses of phytoplankton communities from the Subtropical North Atlantic Gyre to increasing CO2 concentrations and consequent carbonate chemistry changes in the ocean - Azores (ROPICO2)
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectLiving coccolithophorespt_PT
dc.subjectSeasonalitypt_PT
dc.subjectPhytoplankton ecologypt_PT
dc.subjectAzores archipelago (Portugal)pt_PT
dc.subject.pt_PT
dc.subjectFaculdade de Ciências da Vidapt_PT
dc.titleSeasonal and interannual variations in coccolithophore abundance off Terceira Island, Azores (Central North Atlantic)pt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleResponses of phytoplankton communities from the Subtropical North Atlantic Gyre to increasing CO2 concentrations and consequent carbonate chemistry changes in the ocean - Azores (ROPICO2)
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/PTDC%2FAAC-CLI%2F112735%2F2009/PT
oaire.citation.endPage56pt_PT
oaire.citation.startPage43pt_PT
oaire.citation.titleContinental Shelf Researchpt_PT
oaire.citation.volume117pt_PT
oaire.fundingStream3599-PPCDT
person.familyNameMartins Narciso
person.givenNameÁurea
person.identifierAAU-8890-2021
person.identifier.ciencia-id9C10-F9E3-96C6
person.identifier.orcid0000-0002-4319-0241
person.identifier.scopus-author-id52564241900
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublicationc1c53c0c-02ac-4f17-815c-01e1c3fe68fc
relation.isAuthorOfPublication.latestForDiscoveryc1c53c0c-02ac-4f17-815c-01e1c3fe68fc
relation.isProjectOfPublicationf2066c06-c22a-48bf-9025-a9c67a6016e1
relation.isProjectOfPublication.latestForDiscoveryf2066c06-c22a-48bf-9025-a9c67a6016e1

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Seasonal and interannual variations in coccolithophore abundance off Terceira Island, Azores.pdf
Size:
9.28 MB
Format:
Adobe Portable Document Format
Download

Collections

Artigos em revistas internacionais